Intel Arc A580 Suddenly Locked to 75Hz on 100Hz Monitor (Previously Worked at 100Hz)

[hikvision]

Hello ,

I am having an issue with my Intel Arc A580 (8GB) GPU running driver version 32.0.101.8250. I use a 21.5-inch Full HD IPS monitor that supports 100Hz.

When I first set up this system, the monitor correctly showed and ran at 100Hz. Recently, without changing anything, the maximum refresh rate available is now only 75Hz. The 100Hz option has completely disappeared from Windows Display Settings and Intel Graphics Command Center.

Important details:

• The monitor does support 100Hz.

• I am using the same HDMI cable.

• I tested the same monitor and cable on two other systems:

  • A PC with an AMD Ryzen 5 5600GT

  • A laptop with an NVIDIA RTX GPU
    → Both systems still detect and allow 100Hz normally.

• Only my Arc A580 system fails to show 100Hz now.

Troubleshooting done:

• Restarted the PC

• Re-seated HDMI cable

• Checked Windows settings

• Checked Intel Graphics Command Center

• Verified monitor OSD settings

No change — 100Hz remains unavailable.

Could this be a driver-related issue or something affecting the EDID detection on the Arc GPU? Any help would be appreciated.

Thank you!

[CaNeBuRy23]

your Arc A580 is most likely misreading the monitor’s EDID which is why the 100Hz mode completely vanished. the same monitor + cable works on other systems, we can rule out the display and cable right away... let’s hit the fixes that actually matter

Force a Custom 100Hz Resolution

You can manually restore the 100Hz mode:

1. Open Intel Graphics Command Center

2. Go to Display → Custom Resolutions

3. Enter your monitor’s native resolution (e.g., 1920×1080)

4. Set Refresh Rate = 100Hz

5. Apply

If IGCC accepts it, the mode should reappear immediately

Clean reinstall the driver (Fully Reset EDID Cache)

Do NOT just update, wipe it clean:

1. Install DDU (Display Driver Uninstaller)

2. Boot into Safe Mode

3. Select Intel → Clean and Restart

4. Install driver 32.0.101.8250 fresh

This forces the GPU to re-read the monitor’s EDID.

Try a Different HDMI Port or Cable (Even if it “Works Elsewhere”)

Arc GPUs can be picky with HDMI signaling, If you have one, try a High-Speed HDMI 2.0 cable, some older cables handshake differently on Intel cards.

Test via DisplayPort (If Your Monitor Supports It)

DisplayPort avoids many EDID issues entirely. If DP is available, try it, 100Hz should come back instantly

This is almost certainly EDID corruption triggered by the recent driver, not a hardware issue. The card basically “forgot” the 100Hz mode. A clean reinstall or custom resolution usually fixes it instantly